:root {
  --char: #111110;
  --slate: #1c1b19;
  --chalk: #e8d9a8;
  --rule: #e2b33a;
  --paper: #f4efe4;
  --mute: #9a9384;
  --ink: #ece7db;
  --display: "Instrument Serif", "Noto Serif SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 72px; }
body {
  margin: 0;
  background: var(--char);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: var(--rule); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
.dust {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 6;
  opacity: 0.12;
  background-image: url("images/texture.webp");
  background-size: 420px auto;
  mix-blend-mode: overlay;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 80; background: var(--rule); color: var(--char); padding: 8px; }
.chalk {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 28px;
  background: rgba(17, 17, 16, 0.94);
  border-bottom: 1px dashed var(--chalk);
}
.brand { font-family: var(--display); font-size: 26px; }
.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--mute);
}
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--chalk);
  color: var(--chalk);
  padding: 6px 12px;
}
.fold-links { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; }
.fold-links a { color: var(--mute); }
.fold-links a.is-active, .fold-links a:hover { color: var(--chalk); }
.fold-links .live { background: var(--rule); color: var(--char); padding: 6px 12px; }
.hero {
  display: grid;
  grid-template-columns: 1.25fr 0.9fr;
  min-height: 88vh;
}
.canvas { margin: 0; }
.canvas img { width: 100%; height: 100%; object-fit: cover; min-height: 480px; }
.paper {
  padding: 48px 36px 56px;
  background: var(--paper);
  color: #1a1814;
  clip-path: polygon(8% 0, 100% 0, 100% 92%, 0 100%, 0 8%);
}
.paper .kicker { color: #8a6a18; }
.paper .lead { color: #5c5648; }
.kicker {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 11px;
  color: var(--rule);
  margin: 0 0 10px;
}
h1, h2, h3 { font-family: var(--display); margin: 0 0 12px; line-height: 1.05; font-weight: 400; }
h1 { font-size: clamp(40px, 5.6vw, 72px); }
h1 em { font-style: italic; color: #8a6a18; }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
.scheme {
  margin: 22px 0;
  padding: 16px 18px;
  background: #fff;
  box-shadow: 12px 12px 0 var(--char);
  border: 1px solid #1a1814;
}
.scheme button {
  margin-top: 8px;
  background: var(--char);
  color: var(--chalk);
  border: 0;
  padding: 8px 14px;
}
.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; padding: 10px 16px; border: 1px solid currentColor; font-size: 14px; }
.btn.fill { background: var(--char); color: var(--chalk); }
.btn.line { color: #1a1814; }
.w { width: min(1080px, calc(100% - 40px)); margin: 0 auto; padding: 80px 0; }
#need, #nest, #rules { background: var(--paper); color: #1a1814; }
#need .kicker, #nest .kicker, #rules .kicker { color: #8a6a18; }
#need .app-link, #nest .app-link, #rules .app-link { color: #8a6a18; }
.stone { background: var(--slate); }
.tri { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-top: 20px; }
.tri article { background: rgba(255,255,255,0.04); padding: 16px; }
#need .tri article { background: #fff; }
.tri ul, .io ul, #rules ol { margin: 0; padding-left: 1.1em; }
.steps { padding-left: 1.2em; max-width: 50em; }
.steps li { margin-bottom: 10px; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.pair figure { margin: 0; }
.pair img { width: 100%; height: 260px; object-fit: cover; }
.pair figcaption { font-size: 13px; color: var(--mute); margin-top: 8px; }
#rules ol {
  background: #fff;
  padding: 16px 16px 16px 36px;
  border-left: 8px solid var(--rule);
  max-width: 46em;
}
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.io > div { background: #141312; padding: 16px; }
.url { margin-top: 18px; font-family: var(--mono); font-size: 13px; }
footer { padding: 20px 28px 40px; color: var(--mute); font-size: 13px; }
@media (max-width: 900px) {
  .nav-toggle { display: inline-block; }
  .chalk { flex-wrap: wrap; }
  .fold-links {
    display: none;
    width: 100%;
    flex-direction: column;
    background: #141312;
    padding: 12px;
  }
  .fold-links.open { display: flex; }
  .hero, .tri, .pair, .io { grid-template-columns: 1fr; }
  .paper { clip-path: none; }
  h1 { font-size: 38px; }
}